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What keeps a an item cooler, polymer crystals or ice? Find out in this cool science experiment!

This science fair project idea determines which method of hand cleansing is the most effective.

Here's a science activity that lets a first grader use an empty dish detergent bottle to create his own fountain as he explores air pressure.

Learn about the layers of the Earth and make a model! Create a earth layer book, cake, or clay diagram.

In this science project, young children observe, record, and create collections of colors in their world and increase their powers of observation.

In this science fair project, young children observe, record, and create collections of shapes in their world and increase their powers of observation.

Cleaning can be a chore, but not with this sudsy experiment!

Find out whether we can create motion in a dish and as a result, create a wonderful and colorful show.

The objective of this science fair project is to explore the relationship between acidic and basic compounds.

This educated-guessing game is great for preschoolers. This activity helps your child work on her reasoning skills.

Children have a naturally inquisitive mind. Foster their curiosity with a walk through an autumn field or park to answer age-old “why” questions. As you walk with your child, you can encourage them to ask questions.

Here is a hands-on activity to help third graders understand the four points of a compass...and how we use them to get around.

In this activity, you'll not only make your own bouncy balls at home, but your child will also learn how polymers are made.

Explore solids and liquids with your young scientist by making gluep, a goopy substance that can behave like both a solid and a liquid!

In this science fair project, kids measure how weather conditions affect how fast a puddle evaporates.

Air invisible; it doesn't make sounds; you can't pick it up and throw it. So how do we know it exists? Help your second grade scientist figure it out.

Make your own helicopter using a paper clip and a sheet of paper. Hold the spinner up in the air, let it go, and watch it spin gracefully to the ground.

In this experiment you explore how tectonic plates move to create land and expand bodies of water.

Science fair project that determines whether cooling eggs helps them be peeled more easily. Compare the time it took to peel each egg.

Can you dig it? This science experiment isn't for kids who like to keep their hands clean.

Here's a classic celery science experiment that uses celery and food coloring to demonstrate how plants absorb water.

For this science fair project, kids will learn how to make a lemon battery. They can conduct this classic experiment using readily available materials.

What's the science behind those out-of-sight roots? Find out if you can trick roots into growing in different directions.

Make a lei and bring a touch of the tropical lifestyle into your home!

Can a horse lead itself to the carrot? Train your horse with carrots and boxes and test horse memory in this fun zoology science fair project.

Take a closer look at your furry friend (or the furry friend of a neighbor -- with permission) to discover if communication exists between cats and humans.

Kids will learn how to clean fish tank the natural way. Add catfish to the tank and see if your water gets cleaner.

Kids construct a single fixed pulley system to learn how pulleys can make work easier in this cool physics and engineering science fair project idea.

In this free science fair project, build a star clock and learn how to tell time on a clear night by observing the big dipper!

Here's a math, science, and social studies activity: help your kindergartener become a "coin archaeologist" by examining how different coins look and feel.